Non-Uniform Sealant Width for Liquid Crystal Adhesion

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Solution Overview

Problem

In the manufacturing of liquid crystal display devices, the liquid crystal material often comes into contact with not fully hardened sealants, leading to reduced adhesion strength and reliability issues, particularly at the interface between the substrates and sealants.

Innovation Solution

The implementation of a display device design featuring a first and second sealant with varying widths, where the second sealant has a wider width than the first, and an out-of-sealant structure formed along the periphery of the first sealant, reduces the stress on the sealant and prevents the liquid crystal material from thrusting into the sealant interface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a uniform width sealant is used surrounding the display portion, then the manufacturing process is simple, but the liquid crystal material thrusts into the sealant interface causing reduced adhesion strength

Engineering Contradiction:

Improvesealant structure simplicityVSAvoidsealant adhesion strength

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The sealant width is made non-uniform, with a first width in the first direction and a second width in the second direction, where the widths differ. This local variation in sealant geometry prevents liquid crystal material from thrusting into the sealant interface while maintaining manufacturing feasibility

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The sealant structure employs asymmetric width dimensions along different directions (first direction vs. second direction), creating an optimized geometric configuration that reduces stress concentration and prevents liquid crystal intrusion at the sealant interface

Inventive Principle:

Principle #4Asymmetry

2Reliability

If the sealant width is increased to prevent liquid crystal thrusting, then adhesion strength improves, but the device area increases

Engineering Contradiction:

Improvesealant adhesion strengthVSAvoiddisplay device area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Instead of uniformly increasing sealant width throughout, the invention applies different width dimensions locally - a first width in the first direction and a second width in the second direction. This targeted approach provides sufficient adhesion strength where needed while minimizing overall area consumption

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11340501B2Display device

Publication Date: 2022.05.24 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a display device includes a first substrate, a second substrate, a first sealant surrounding a first chamber and a second chamber between the first substrate and the second substrate, a second sealant disposed between the first chamber and the second chamber, and a liquid crystal layer with which the first chamber and the second chamber are filled. The first chamber includes a first display portion including a first pixel. The second chamber includes a second display portion including a second pixel. The first sealant includes a first wall having a predetermined width and a second wall having a width less than the width of the first wall.